<template>
  <div>
     <div class="father">
       <div class="box" @click="id=1" :class="{active:id===1}">1</div>
       <div class="box" @click="id=2" :class="{active:id===2}">2</div>
       <div class="box" @click="id=3" :class="{active:id===3}">3</div>
     </div>
   </div>
</template>
 
<script>
export default {

  data() {
    return {
     id:1
    };
  },

  methods: {
   
  }
};
</script>

<style scoped>
    

     .box {
        border: 1px solid #333;
        width: 250px;
        height: 200x;
   
     }
     .father {
       display: flex;
     }
      .active {
        background-color: #087;
     }
</style>